body{
  background:url('../image/flower.jfif');
  background-size: 100% 100vh ;
}
.login-title{
  margin-top: 14.125rem;
  color: skyblue;
}
.login-form{
  margin-top: 5rem;
  width: 40.5rem;
  border: 1px solid white;
  background-color: rgba(255, 255, 255, 0.5);
  
}
.login-form .control-group{
  margin-top: 2.5rem
}
.login-form label{
  font-size: 1.875rem;
  margin-right: 1.25rem;
  height: 3.75rem;
  line-height: 2.5rem;
}
.login-form input{
  font-size: 1.875rem;
  padding-left: .625rem;
  height: 3.75rem;
  line-height: 2.5rem;
}
.login-form .login-btn{
  margin-bottom: 2.5rem;
  font-size: 1.875rem;
  width: 12.5rem;
  /* 设置饱和度 */
  filter:saturate(300%);
}